Sponsor(s): Chinese Mechanical Engineering Society
24 issues per year
Current Issue: Issue 14, 2019
Journal of Mechanical Engineering, the 1st in the field of mechanical engineering, is supervised by China Association for Science and Technology (CAST) and sponsored by Chinese Mechanical Engineering Society (CMES). The journal aims to become an international academic journal of mechanical engineering. Its scope covers mechanics, manufacturing science and technology, instrument science and technology, materials science and engineering, carrying engineering, renewable energy and engineering thermophysics, fluid transmission and control, deep sea equipment technology, and automation control. The journal is included in CA, JST, Pж(AJ), EI, CSCD.
Wang Buxuan;Lu Yongxiang
Wang Wenbin;Wang Guobiao
Chen Xuedong;Chen Chaozhi
Huang Tian;Luo Jianbin
Journal of Mechanical Engineering,2019,Vol 55,No. 14
At present, the heat-transfer mechanism of spray cooling enhanced by surface structures is not clear. With distilled water as the working fluid, experiments are conducted to study the effects of flow rate, groove depth, and surface temperature on heat-transfer characteristics of spray cooling of radial groove surfaces and flat surfaces. Heat-transfer mechanism of spray cooling is discussed according to the final temperature of cooling fluid, the liquid phase-change capacity, and experimental photos. Experimental results indicate that heat flux and surface temperature grow with the increase in spray flow rates. Radial groove surfaces obtain better heat-transfer performance in comparison to flat surfaces, and when the groove depth rises, heat flux of radial groove surfaces is also on the increase, especially in the boiling regime. The key factors which determine heat transfer in non-boiling regime is the fast-moving liquid film, but in the boiling regime, bubble rupture and droplet impact on the contact walls are more important. When the radical-groove depth exceeds the thickness of the liquid film, increasing the groove depth is unfavorable to the heat transfer in the non-boiling regime, but the deep grooves can provide more vaporization cores, which is beneficial to the enhancement of the heat transfer in the boiling regime. The research on the influence of groove structure, the determination of phase change, and the discussion over the heat-transfer mechanism enrich the theory of spray cooling, which lays the groundwork for further perfecting the spray cooling model.